starting to look at trucks

I have a 2018 F-150 Lariat with the 3.5 EcoBoost, 10 speed transmission, and 3.55 gears. My trailer is almost 35' from tongue to bumper and over 8,000 pounds fully loaded. Power is not a problem at all. I feel like the truck could pull a lot more weight, easily. However, I feel like I'm maxed out on suspension. I have spent a lot of money to get the truck to handle the weight. E-rated tires ($1,200), Bilstein shocks ($300), Hellwig rear sway bar ($400), and the big one, a ProPride 3P-1400 hitch ($3,000). The truck tows great now. No problems. Gas mileage is about 8 mpg at 65 mph. If I had it to do over again, I'd be getting a 3/4 ton diesel. This setup works great for me now though and the F-150 is an awesome vehicle. I absolutely love it. I do plenty of non-towing driving and the 3.5L has gobs of power. It's like a sports car! No way in hell I'd buy the 5.0. I plan on keeping the truck for a few more years until we go full time. Then I'm getting a one ton dually.